This deal gets you from Boston to London in business class for 75,000 Aeroplan miles, a meaningful discount from the roughly 110,000 miles you'd normally expect to pay for this transatlantic route. Taxes and fees come in at a reasonable $108, which is on the lower end for flights into the UK.
Availability appears strong for July 20, 2026, with plenty of seats showing in the system. Summer transatlantic business class awards are notoriously difficult to find, so seeing open inventory more than a year out is worth acting on if your schedule allows.
Keep in mind that Aeroplan uses dynamic pricing, so these rates can shift without warning. If you have the miles and this date works for your family, it's worth locking in sooner rather than later. You can transfer points to Aeroplan from American Express Membership Rewards, Chase Ultimate Rewards, and Capital One miles if you need to top off your balance.
How to book
Search and book directly through Air Canada's website: https://www.aircanada.com/us/en/aco/home/aeroplan/redeem/flight-rewards.html